Green is associated with healing / Raphael, for example.
So if you asked me that question on a street corner, I’d answer it’s Raphael healing you and keeping you stable throughout your sleep deprivation.
However, since you ask me here, on balg, I feel such an easy answer might be to little.
The green energy emerged at your neck / zeal Chakra, which means the healing had to do with your memory and sense of karma.
The neck probably felt like it had a dark, crispy energy inside it, during that period of time.
If so, your sense of identity has been affected, and you’ve overcome a fear, or confronted something you’ve been scared of.
The symbol I see, in the green mist, is a mixture between sol and venus, which means you’ve been given solar female energy.
Or to put it simpler, you’ve been healed with female light / bliss.
You probably felt more innocent than before, maybe got over an argument or fight that you had before.
Taking into count your physical appearance, I’d assume you’ve been dealing with something in your family, a child that had chosen to go a route you didn’t like, most probably.
The kid made a decision, you disagreed on, and you 've now come to peace with it better /more.
That, is what I get from the picture.
In terms of the green mist, I have a tip for you:
Take a candle, and sit in meditation.
Draw the mist from the picture into the candle flame, and speak to it.
Ask who it is, and wait for it to answer.
(listening into the silence, a voice May emerge and answer you.)
you’ll get more information for yourself, directly when doing that.
If it is archangel Raphael (wait for the spirit to tell you its name. But be aware, that the answer might be a different name / language, when it comes to you. Note it down, if you want to research it afterwards.)
So if it is Raphael, I suggest you make a small offering for Raphael, to thank him for his help.